Apparatus for delivering an intermittent air-blast.



R. B. BENJAMIN & W. COTTRELL.

APPARATUS FOR DELIVERING AN INTERMITTENT AIR BLAST.

APPLICATION FILED MAR. 2. 1914.

1,206,086. Patented Nov. 28, 1916.

il -h 1 M /Mm VdZf/ REUBEN B. BENJAM N AND WILLIAM 'co'rrRELL, or CHICAGO, ILLINOIS, AssINoPts filo-BENJAMIN ELECTRIC MANUFACTURING; COMPANY, OF CHICAGO, ILLIN IS, A

CORPORATION O ILmNOIs.

APPARATUS FOR DELIVERING AN IN'I'EBMITTENT IR-BLAST.

To all whom it may concern:

Be it known that we, REUBEN B. -BEN- JAMIN and WILLIAM COTTRELL, both citizens of the United States, residingat Chicago,

in the county of Cook and State of Illinois, have jointly inventednew and useful Im-J provements in Apparatus for Delivering an Intermittent Air-Blast, of which the fol- I to provide an intermittent air blast appalowing is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

Our inventlon relates to improvements in apparatus for delivering an intermittent aif'blast.

It isone of the objects of our invention ratus that will deliver a blast ,at the proper time and of the proper intensity and 'duration, to remove work and Waste materials ."from the working tables of punch presses,

errzibossing and stamping machines, andthe li e. l

It is a further object of our invention to provide. means for adjusting the time o the blast with relation to the stroke of the machine with which it is used, and means I for adjusting the intensity and duration of the blast delivered.

A further object of our invention is to provide an intermittent air blast apparatus that is simple and kefiicient in its operation,

' economical to manufacture, and readily installed on machines of various types.

- Additional objects of our invention will be apparent from the following specification and accompanying drawing, taken in connection with the appended claims.

An air valveembodyingour invention-is described in the following specification and illustrated in the accompanying drawings, by way of example, it being clearly understood that numerous changes maybemade in the form, construction and arrangement of. the parts without departing from the spirit of our invention or exceeding the scope of the appended claims, the form of our invention herein disclosed being merely one preferred embodiment thereof.v .---In the drawing, Figure 1 is a view inperspective of a punch press having an intermittent air blast 'apparatusconstructed in accordance with ourinvention attached thereto; Fig. 2 is a detailed view inside ele- .terial.

, Specification of Letters Patent. Patented No 28, 1916. Application filed ma 2,- 1914. Serial No. 822,082.

tent blast at the table of the machine after I the ram has. cpnimenced its upward stroke for the purpose of assisting in removing each piece of work after it has been stamped, and also the filings and other waste mas Attached to thepunch press 5 is a pipe 6 leading from a source of air under pressure. This pipe 6 is secured to the press 5 by a strap 7 which passes over the pipe and is bolted to the press as at 8. The end of the pipe is'screW-threaded to make engagement with the threaded port of a valve casing. 9which is in the form'of an elbow having also a screw-threaded opening for.

engagement with a pipe 10 to which is at tached a flexible hose 11 leading to a nozzle 12 located near the work table 13 of the i press. In the valve casing 9, approximately at the end .of the feed pipe 6 is a slightly conical shaped valve seat 14, in which is located the valve member 15. Secured to the latter and extending forwardly therefrom is a valve stem 16which' protrudes a short distance from the valve casing 9-. The valve 15 conforms in configuration with the valve seat 14, and as the stem is substantially loose inits bearings, valve and stem are freely rotatable. Accordingly the valve does not necessarily reseat in the same pos1 tion and irregular wear of the parts is avoided. -A lug .17 is formedat the lower I part of the valve casing 9 and to thislug I is pivoted a stem-displacing trigger 18. The

inner edge of this trigger bears continuously on the end of the valve stem 16 and in its normal position the trigger is inclined slightly'away from thev'ertica'l. It 'will be seen that if this pivotei trigger 18 is moved inwardly it will displace the valve stem,

thereby opening the valve. Means are ra v gvided,.therefore, for operating trigger 18 g once every cycle of" the ram 19 ofthe press 5. Attached to the ram 19 is a bracket 20 a we e d 3- 1552-1 to which is bolted a tripper 21. -At the upper i T end of the latter, pivoted to a lug 22, isa' roller 24:. The tripper 21 is so positioned that it comes into contact with the trigger 18 at each stroke of the ram. In order that the valve may be operated only once for every cycle of the ram, the tripper arm 23 is so pivoted that it is free to swing upwardly, but is prevented from swinging downwardly. Asa result of this construction, when the ram is making its downward stroke the tripper arm upon striking the upper end of the trigger 18 will merely be forced upward into an inoperative position. As the roller 24 moves out of engagement with the end ofthe trigger 18 it is free to drop back into normal position under the force of gravity. On the up stroke of the ram, however, as the trigger 18 is inclined across the path of the roller the former will be moved inwardly and the valve opened.

The tripper 21 is formed with a longitudinal slot 25' and is secured to the bracket 20 by means of a bolt 26, passing through the slot 25, and a nut 27. It will be seen that by loosening the nut 27 of the bolt 26 the position of the tripper 21 on the bracket may be varied, both 'vertically and angularly, the function of which is hereinafter referred to.

In operation, it being assumed that the ram of the press is making a regular reciprocating stroke, on the downward stroke of the ram there is no operation of the valve, as before described. This is shown by Fig. 2, the dotted lines showing the position of the parts at the moment the roller comes in contact with the trigger and the full lines showing the parts as the ram continues its down- I ward stroke with the tripper arm 23 swung upward into inoperative position. The operation of the valve on the up stroke of the ram is shown in Fig/3. The full lines denote the position of the tripping mechanism when the ram is at the end of its downward stroke. As it moves upward the tripper arm will force the trigger 18 inwardly as shown by the position of the parts in dotted lines. As the trigger bears on the stem 16, the latter will be displaced thus opening the valve and allowing the air to flow through the pipe 10 to the nozzle 12.

. It will be seen that the valve remains open as long as the tripper arm 23 is in operative contact with the trigger 18. As the ram passes upward the arm 23 will roll clear of the trigger and, owing to the position of the valve member 15, the force of the air in the pipe 6 acting directly thereon, will cause the valve to automatically reseat, whereupon the valve and trigger will again take their normal position until the next upward stroke of the ram. v

It will be apparent that the duration of the blast as well as its'intensity will depend upon the extent to which the valve is opened and upon the time during which it is open.

As the edge of the trigger which is in the tact with the trigger. Consequently the extent andduration of such displacement may be varied by varying the position of the tripper with respect to the stem-displacing trigger. This is done by loosening the nut 27 and swinging the tripper 21 to change its angular position one Way or the other, as desired. 1f the tripper 21 is displaced from the vertical, as for example, to the position shown in Fig. 4:, the tripper roller is farther away from the trigger 18 than it was in its normal position. As a result, its contact with the trigger is not made until the roller reaches approximately the upper end of the trigger. Consequently the tripper arm will give the trigger but a slight tap thereby opening the valve to but a slight extent, and for a short interval of time.

By altering the vertical position of the can be adjusted as desired. It the tripper 21 is shifted until the nut 27 is at the lower end of the slot 25 the blast will come earlier on the upward stroke of the ram than it does in the normal position illustrated in Fig. 3. On the other hand, if the nut 27 is at the upper end of the slot 25 the blast will be delayed. By this simple adjustment of the tripper on the bracket of the ram, we are enabled to vary the time, intensity and duration of the air blast delivered to meet practically all the demands of the various kinds of machines anddwork with which our apparatus may be use Having thus described our invention what We claim as new and desire to secure by Letters Patent is ,1. An apparatus for delivering an intermittent air blast, adjacent the material operated on by an intermittently operated machine comprising the combination with a valve, of a reciprocating member, means as-' sociated therewith for opening said valve at desired intervals, and adjustable means for varying the duration and extent of said opening thereby tovary the duration and intensity of the blast.

2. An apparatus for deliverying an intermittent air blast, adjacent the material operated on by an intermittently operated machine comprising the combination with a valve, of a reciprocating member, means astripper 21 with respect to the bracket 20 the termittent air blast, a valve having a stem protruding from the valve casing, a reciproeating member having a tripper associated therewith, a stem-displacing member asso-' protruding from the-valve casing, a reciproeating member having a tripper associated therewith, a stem-displaclng member associated with said valve stem and operated by' said tripper to open said valve, means for varying th'e'position of sai tripper with respect to the position of said reciprocating member to vary the time of said air blast with respect to the stroke of said member,

and means for varying the position of said tripperi with respect to said stem-displacing member to vary the intensity and duration of said air blast.

5. In an apparatus for delivering an intermittentair blast, a valve'havinga stem protruding from the valve casing, a reciprocating member having associated therewith a vertically and angularly adjustable tripper, and a stem-displacing tripper-operatedmember associated with said valve stem.

, 6. The combination with an intermittentlyoperated machine having a tool movable in a definite path, of means for delivering a blast adjacent the path ofsaid tool, means for controlling said blast comprising a valve and automatic means whereby said valve is intermittently operated in time with the movement of said tool, and means wherebythe extent of opening of said valve may be varied.-

7 A device for use with an intermittently operated machinehaving a tool' movable in a definite path, said device comprising means fordelivering a blast adjacent the.

path of said tool, means for controlling said blast comprising a valve, and automatic v means controlled by said machine whereby said valve is intermittently operated, and means whereby the extent of opening of said valve may be varied.

8. A device for use with an intermittently operated machine having a tool movable in a definite path, said device comprising means for delivering a blast adjacent the path of'said tool, means for controlling sald .blast comprising a valve, automatic means controlled by said machine whereby tently operated machine having a tool mov-- able in a definite path, said device comprising means for delivering a blast adjacent the path of said tool, means for controlling said blast comprising a valve having a casing, means forsecuring said casing in a fixed position, and a movable member controlled by' said machinewhereby said valve is intermittently operated, and means whereby said movable member can be manually adjusted to vary the extent of opening of sald valve. Y

10. A device for use with an intermittently operated machine having a tool movable in a definite path, saidfdevice compris ing means for delivering a blast adjacent the path of said tool, means for controlling said blast comprising a valve having a casing, means for securing said casing in a fixed position, and a movable member controlled by said machine whereby said valve .is intermittentlyv operated, and means whereby said movable member can be manually adjusted to vary the extent of opening of said valve, and also to'vary the time of operaizion of said valve. with respectto said too a 11. A device for use with an intermittently operated"machine having a tool movable in a definite path, said device comprising means for delivering a blast adjacent- 1 a the pathofsaid tool, means for controlling said blast comprising a valve having a casing, means for securing said casing in a fixed position, and a movable member c0ntrolled by said machine whereby said valve is intermittently operated, and means whereby said movablle member canbe manually adjusted in one direction to vary the-extent of opening of said valve and in another direction to vary the time of operation of said a valve with respect to said tool) In witness whereof, we have hereunto subscribed ourn'ames in the presence of two witnesses,

REUBEN B. BENJAMIN.

WILLIAM COTTRELL- Witnesses: I

E. R. KING, *W. PERRY EHAjI-IN. 

